Running your code produces the following console output on my machine (Windows 7, ActivePerl):

0 τι κάνετε;
1 πάρτε το ή αφ&#942
+;στε το
2 שלום חברים
3 abc לא כןכן efg
4 מתי ולאן This is it
5 מעכשיו לעכ&#15
+13;יו 
6 Σήμερα είναι 
+Τρίτη
7 Θέλω να φάω
8 τι κάνετε;
9 שורה מס' 5

[download]

The tied-file's contents:

τι κάνετε;
πάρτε το ή αφή&
+#963;τε το
שלום חברים
abc לא כןכן efg
מתי ולאן This is it
מעכשיו לעכ&#1513
+;יו 
Σήμερα είναι &#
+932;ρίτη
Θέλω να φάω
τι κάνετε;
שורה מס' 5

[download]

I didn't get the errors you're reporting.

On a separate topic, Tie::File works well with smaller files, but performance significantly slows with files > 10M, in case you may be working with such.

In reply to Re: Tie::File failing with Unicode/UTF-8 encoding? by Kenosis
in thread Tie::File failing with Unicode/UTF-8 encoding? by HelenCr

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.